5FKR

Unraveling the first step of xyloglucan degradation by the soil saprophyte Cellvibrio japonicus through the functional and structural characterization of a potent GH74 endo-xyloglucanase


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.28 Å
  • R-Value Free: 0.268 
  • R-Value Work: 0.210 
  • R-Value Observed: 0.213 

wwPDB Validation   3D Report Full Report


This is version 1.3 of the entry. See complete history


Literature

Functional and Structural Characterization of a Potent Gh74 Endo-Xyloglucanase from the Soil Saprophyte Cellvibrio Japonicus Unravels the First Step of Xyloglucan Degradation.

Attia, M.Stepper, J.Davies, G.J.Brumer, H.

(2016) FEBS J 283: 1701

  • DOI: 10.1111/febs.13696
  • Primary Citation of Related Structures:  
    5FKQ, 5FKR, 5FKS, 5FKT

  • PubMed Abstract: 
  • The heteropolysaccharide xyloglucan (XyG) comprises up to one-quarter of the total carbohydrate content of terrestrial plant cell walls and, as such, represents a significant reservoir in the global carbon cycle. The complex composition of XyG requires a consortium of backbone-cleaving endo-xyloglucanases and side-chain cleaving exo-glycosidases for complete saccharification ...

    The heteropolysaccharide xyloglucan (XyG) comprises up to one-quarter of the total carbohydrate content of terrestrial plant cell walls and, as such, represents a significant reservoir in the global carbon cycle. The complex composition of XyG requires a consortium of backbone-cleaving endo-xyloglucanases and side-chain cleaving exo-glycosidases for complete saccharification. The biochemical basis for XyG utilization by the model Gram-negative soil saprophytic bacterium Cellvibrio japonicus is incompletely understood, despite the recent characterization of associated side-chain cleaving exo-glycosidases. We present a detailed functional and structural characterization of a multimodular enzyme encoded by gene locus CJA_2477. The CJA_2477 gene product comprises an N-terminal glycoside hydrolase family 74 (GH74) endo-xyloglucanase module in train with two carbohydrate-binding modules (CBMs) from families 10 and 2 (CBM10 and CBM2). The GH74 catalytic domain generates Glc4 -based xylogluco-oligosaccharide (XyGO) substrates for downstream enzymes through an endo-dissociative mode of action. X-ray crystallography of the GH74 module, alone and in complex with XyGO products spanning the entire active site, revealed a broad substrate-binding cleft specifically adapted to XyG recognition, which is composed of two seven-bladed propeller domains characteristic of the GH74 family. The appended CBM10 and CBM2 members notably did not bind XyG, nor other soluble polysaccharides, and instead were specific cellulose-binding modules. Taken together, these data shed light on the first step of xyloglucan utilization by C. japonicus and expand the repertoire of GHs and CBMs for selective biomass analysis and utilization.


    Organizational Affiliation

    Michael Smith Laboratories and Department of Chemistry, University of British Columbia, Vancouver, Canada.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
ENDO-1,4-BETA-GLUCANASE/XYLOGLUCANASE, PUTATIVE, GLY74AA731Cellvibrio japonicus Ueda107Mutation(s): 0 
Gene Names: gly74ACJA_2477
EC: 3.2.1 (PDB Primary Data), 3.2.1.151 (PDB Primary Data)
UniProt
Find proteins for B3PKK9 (Cellvibrio japonicus (strain Ueda107))
Explore B3PKK9 
Go to UniProtKB:  B3PKK9
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
BR
Query on BR

Download Ideal Coordinates CCD File 
B [auth A]BROMIDE ION
Br
CPELXLSAUQHCOX-UHFFFAOYSA-M
 Ligand Interaction
EDO
Query on EDO

Download Ideal Coordinates CCD File 
D [auth A]1,2-ETHANEDIOL
C2 H6 O2
LYCAIKOWRPUZTN-UHFFFAOYSA-N
 Ligand Interaction
K
Query on K

Download Ideal Coordinates CCD File 
C [auth A]POTASSIUM ION
K
NPYPAHLBTDXSSS-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.28 Å
  • R-Value Free: 0.268 
  • R-Value Work: 0.210 
  • R-Value Observed: 0.213 
  • Space Group: P 21 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 87.89α = 90
b = 131.91β = 90
c = 73.17γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
Aimlessdata scaling
MOLREPphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2015-11-25
    Type: Initial release
  • Version 1.1: 2016-03-16
    Changes: Database references
  • Version 1.2: 2016-05-18
    Changes: Database references
  • Version 1.3: 2017-09-13
    Changes: Data collection